clarify sort_natural and fix unless syntax

lib/liquid/standardfilters.rb

@@ -358,7 +358,11 @@ module Liquid
     # @liquid_type filter
     # @liquid_category array
     # @liquid_summary
-    #   Sorts the items in an array in case-insensitive alphabetical, or numerical, order.
+    #   Sorts the items in an array in case-insensitive alphabetical order.
+    # @liquid_description
+    #   > Caution:
+    #   > You shouldn't use the `sort_natural` filter to sort numerical values. When comparing items an array, each item is converted to a
+    #   > string, so sorting on numerical values can lead to unexpected results.
     # @liquid_syntax array | sort_natural
     # @liquid_return [array[untyped]]
     def sort_natural(input, property = nil)

lib/liquid/tags/unless.rb

@@ -15,7 +15,7 @@ module Liquid
   # @liquid_syntax
   #   {% unless condition %}
   #     expression
-  #   {% endif %}
+  #   {% endunless %}
   # @liquid_syntax_keyword condition The condition to evaluate.
   # @liquid_syntax_keyword expression The expression to render unless the condition is met.
   class Unless < If